(57) In order to realize a method of color correction which is capable of performing
the UCR compensating for the non-linearity of the superposed densities and the non-linear
color correction meeting the non-linearity of the superposed densities at high accuracy
with a configuration in substantially the same scale as the conventional linear UCR
and linear masking techniques, there is provided a color correction method comprising
first conversion means (4, 5, 6) for converting the C, M, Y density information by
a monotonously incremental non-linear function with a similarly monotonously incremental
derivative, matrix means (7), and second conversion means (8, 9, 10) for converting
the same density information by a monotonously incremental non-linear function with
a monotonously decremental derivative. In another aspect, there is provided four-color
reproduction means comprising first conversion means (104-106; 204-206; 304-306)
for converting the C, M, Y information by a monotonously incremental non-linear function
with a similarly monotonously incremental derivative, second conversion means (112-115;
212-215; 312-315), for effecting the conversion with a monotonously incremental non-linear
function with a monotonously decremental derivative, and black separation means (108;
208, 308), subtraction means and matrix means (107; 207; 307) interposed between
the first and second conversion means for controlling the densities of the four inks
to implement color recording.
|
|
